EVERYDAY SCIENCE

Detailed explanation-1: -Liver converts lactic acid back to glucose which needs oxygen.

Detailed explanation-2: -When sufficient oxygen is available, lactic acid gets oxidized to carbon dioxide (CO2), water (H2O) and ATP. Q.

Detailed explanation-3: -Lactic acid can be removed in the following ways: Oxidation into carbon dioxide and water in the inactive muscles and organs. Used by the muscles as an energy source. Transported in the blood to the liver where it is converted to blood glucose and glycogen (cori cycle, see Key terms).

Detailed explanation-4: -Lactate is an important intermediate metabolite in human bioenergetics and is oxidized in many different tissues including the heart, brain, kidney, adipose tissue, liver, and skeletal muscle. The mechanism(s) explaining the metabolism of lactate in these tissues, however, remains unclear.

Detailed explanation-5: -Lactic acid is produced and starts to build up in muscle cells as a direct by-product of glucose being converted to energy. More oxygen is needed to help break down this lactic acid. Oxygen debt-when oxygen can no longer reach cells to break down lactic acid at the same rate it is being produced, oxygen debt occurs.